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Abstract

Some effects connected with multiple passes of pump radiation in laser pump cavities are discussed. These effects include changes in mercury arc lamp operating characteristics, when the lamps are used inside the cavities as pump sources, and unexpectedly low pulse (but not cw) thresholds in double elliptical cavities. It is shown analytically that these effects can, at least in part, be attributed to the shapes of the pump light energy distribution curves after multiple passes through the pump cavities, and to the relative opacities of flash and continuous lamps.

References

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a See Fig. 5. Focus No. 3 is occupied by the ruby rod.b Data obtained with different ruby rod and lamp (of the same type) from the data in the rest of the table. Therefore, only the relative light input is of significance.

Table II

Dependence of Mercury Lamp Performance in a Single Elliptical Cylinder Cavity on the Amount of Light Allowed to Return to the Lamp

One of the foci occupied by

Maximum input into the lamp with 1800 V across it, W

—

1360

Ruby rod, 2 mm diam

1430

Carbon rod, 2 mm diam

1730

Tables (2)

Table I

Measured Pulse Thresholds in Single and Double Elliptical Cavities under Various Conditions

a See Fig. 5. Focus No. 3 is occupied by the ruby rod.b Data obtained with different ruby rod and lamp (of the same type) from the data in the rest of the table. Therefore, only the relative light input is of significance.

Table II

Dependence of Mercury Lamp Performance in a Single Elliptical Cylinder Cavity on the Amount of Light Allowed to Return to the Lamp